Selected Quarterly Financial Informaiton

12 Months Ended

Dec. 31, 2011

Effect of Fourth Quarter Events [Line Items]

Schedule of Quarterly Financial Information [Table Text Block]

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2011
Revenue	$	29,298,000	$	30,662,000	$	32,202,000	$	32,895,000
Gross profit	$	12,164,000	$	12,313,000	$	12,455,000	$	12,733,000
Operating income	$	6,285,000	$	5,934,000	$	5,436,000	$	2,881,000
Net income	$	3,761,000	$	3,624,000	$	3,347,000	$	8,306,000
Basic net earnings per share	$0.35		$0.34		$0.31		$0.78
Diluted net earnings per share	$0.34		$0.33		$0.30		$0.75
2010
Revenue	$	22,206,000	$	22,209,000	$	22,916,000	$	26,976,000
Gross profit	$	7,480,000	$	8,031,000	$	8,671,000	$	10,445,000
Operating income	$	2,444,000	$	2,692,000	$	4,270,000	$	5,063,000
Net income	$	1,479,000	$	1,568,000	$	2,615,000	$	2,858,000
Basic net earnings per share	$0.14		$0.15		$0.25		$0.27
Diluted net earnings per share	$0.14		$0.15		$0.24		$0.26